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Line segment is part of a line. It has to endpoints. A point is a location in space. Lines that cross each other are intersecting. Two lines that form right angles are perpendicular. You can draw a line through any two points. A line goes on without end in both directions. An angle that makes a square corner is called a right angle. (90 degrees) Lines that are always the same distance apart are parallel. A ray is a part of a line. It has one endpoint and goes on without end in one direction. Strait angle is an angle that forms a straight line. An angle is formed by two rays with a common endpoint. The common endpoint is the vertex of the angle. An angle can be measured in units called degrees. (Written as °) You will measure angles between 0° and 180° A protractor is used to measure an angle. Obtuse angle is an angel greater than a right angle. An acute angle is an angle that is less than a right angle. A polygon is a flat, closed plane figure made up of three or more line segments called sides. The sides only meet at their end points. Triangle 3 sides and 3 angles Quadrilateral 4 sides and 4 angles A square had 4 sides of the same length and 4 right angles. Pentagon 5 sides and 5 angles A trapezoid has only 1 pair of parallel sides. Hexagon 6 sides and 6 angles A parallelogram has opposite sides parallel and of the same length. Octagon 8 sides and 8 angles Rectangle has opposite sides parallel and 4 right angles. A rhombus has opposite sides parallel and 4 sides the same length. Obtuse Triangle has one obtuse angle. Equilateral Triangle has all sides the same length. Acute Triangle has all angles that are acute. Isosceles Triangle has at least 2 sides that are the same length. A circle is made up of all points in a plane that are the same distance from a given point in that plane. Scalene Triangle has no sides the same length. Right Triangle has 1 right angle. A radius is any line segment that joins a point on the circle to the center of the circle. A diameter is any line segment that passes through the center of a circle and has its endpoint on the circle. A chord is any line segment that has its endpoint on the circle. It does not need to pass through the center.